Single roll crusher with opposed toothed-apron feed



March 15, 1949. KEIPER 2,464,774

. SINGLE ROLL CRUSHER WITH OPPOSED TOOTHED-APRON FEED 7 Filed April 22, 1946 2 Sheets-Sheet l March 15, 1949. KEIPER 2,464,774 7 SINGLE R SHER WITH OPPOSED TOOTH :APRON FEED- 2 Sheets-Sheet 2 Filed April 22, 1946 zw ygw ATTO R N EY Patented Mar. 15, 1949 UNITED STATES PATENT O'FFlCE- SINGLE ROLL CRUSHER WITH OPPOSED TOOTHED-APRON FEED Edwin H. Kaiser, Philadelphia, -Pa., assignor to Pennsylv nia Crus r C mpa y, Phil delphia, Pa., a corporation of New'York Application'April 22, 1946, Serial No. 664,057

Fig, l is a vertical sectional view through the mac in Fig. 2 is a plan view on reduced scale of'the machine shown in Fig. 1; and

Fig. 3 is a partial vertical sectional view of a modified form.

In the accompanying drawings the roll crusher frame comprises side pieces 9, base plate I and end piece II, the hopper I2 being mounted as shown on the frame having a slanting end portion coinciding in direction with the cross piece I 3 and delivering material through the opening between the cross piece and the edge I4 of the opposite member of the hopper.

A roll crusher shaft I5 mounted in bearings in the side pieces 9 carries the crusher roll I6 having teeth I1, I8, and the crushed material is discharged downward through the opening in the base plate I0 and the outlet I9.

A traveling breaker plate structure 20 composed of a continuous chain having link members 2| with teeth 22 is positioned as shown to approach the periphery of the crusher roll at an angle across the feed of the material from the hopper I2, the crusher roll rotating clockwise as indicated and the breaker plate sections moving downward adjacent the roll. The breaker plate chain travels around the lower or pulling sprocket 24' on shaft 25 and around the upper sprocket on shaft 36 within the cover piece 35 mounted on the frame 9, II. The drive for the sprocket shaft 25 (Fig. 1) is by chain 26 from speed change mechanism 21 driven in turn by chain 28 from the countershaft 29 driven by a belt 30 from the motor 3I. Countershaft 29 has its opposite end as the drive pinion 32 driving the gear 33 of the crusher roll shaft I5.

A slide plate 40 mounted by its ribs 4| on cross shafts 42 between the side plates 9 supports the breaker plate chain as it moves downward with the material toward the crusher roll. This traveling breaker plate or apron moving downward with a lineal Sp ed of 3 to 4' per minute, for instance, forms a retaining movable wall for the material, constantly tending to drag the material down between the roll crusher teeth and the apron moving in the same direction at a lesser Speed to the crushing area, Here the teeth of the roll and the teeth of the apron cooperate to break the material, the major teeth I8 of the crusher preferably having their tips moving in the grooves separating the teeth 22 of the chain or apron.

In this manner the bottom and the side of the chamber receiving the material from the hopper I2 both move downward in the same direction along converging lines to drag the material in be-, tween them, this combination being particularly effective in handling wet and sticky materials and avoiding any arching over or packing of these materials. The discharge opening I3, I4 of the hopper I2 is large and directed downward at an angle, and the traveling apron 20 proceeds downward from the top point well above the lower lip I3 of the hopper and substantially on a level with the upper edge I4 of the hopper opening.

This combination of the hopper formation and the cooperating traveling surface of the roll and apron will take bauxite and other similar plastic or wet materials and subject them to effective reduction from relatively large pieces, 24 to 30" to smaller fragments such as 1 to 1 the exact reduction depending, of course, upon the hardness and size of the entering pieces of the material.

In Fig. 3 a modification is shown mounting the apron chain 20 on an upper sprocket 41 of shaft 46 which may be driven, and carrying the lower portion of the chain around an auxiliary endless roller link belt running around the lower cylinder 50 on shaft 48, and the upper cylinder roller 52 on shaft 5| between the sides 9 of the frame. The shaft 48 is preferably driven as by a chain running on sprocket at the end of the shaft. Slide plates joined by web members 56 are mounted on cross bars 51 between the frame sides 9 and the crushing thrust against the apron is transmitted from the apron links 2| to the rollers 53 and thence to the slide plates 55 so that these rollers 53 join together in endless chain formation by links 54 and move downward with the chain 20 at about one-half the speed of the chain and form an intermediate roller support between the chain and the slide plate 55 reducing the frictional resistance between the apron and the plate.

The wide hopper opening provides an extensive feed of the material to the moving surfaces of the roll and apron so as to avoid any constrictions or bottle-necks, and in effect submitting the entire mass of the hopper feed to the action of the moving surfaces so that the material is compelledto follow down into the grip of the crusher action betweenthe roll and the apron.

I claim:

1. In a roll crusher the combination with a roll turning in a predetermined direction, of a feed hopper vertically above the center of said roll and comprising an inclined end surface terminating at one side of the top of the roll and discharging material from the hopper onto the top part of the roll periphery, and endlessl's'e'ries of links providing a sliding apron at the opposite side of said hopper receiving material therefrom and extending downward at the other side of said roll from substantially above the top of the roll' to the level of the center thereof so that the entire mass of the hopper feed is engaged by the moving surfaces of the roll on one side and the sliding apron on the other and is drawn into the grip of the crusher action between the roll and the apron as they come together, cooperating teeth on said roll and apron, and means for driving said roll and said apron at predetermined relative speeds to draw in and crush said material between them.

2. In a roll crusher the combination with a'roll turning in a predetermined direction, of a feed hopper vertically above the center of said roll and comprising an inclined end surface terminating at one side of the top of the roll and discharging material from the hopper onto the top part of the roll periphery, a substantially vertical wall for said feed hopper opposite the upper portion of said inclined end surface, an endless series 4 of links providing a sliding apron at the opposite side of said hopper receiving material therefrom and inclined downward from adjacent the lower end of said vertical wall to adjacent the vertical periphery, of the roll at the side of said hopper opposite to said inclined end surface, said apron receiving material from said hopper and moving it downward toward said roll so that 'the entire mass of the hopper feed is engaged by the moving surfaces of the roll on one side and the sliding apron on the other and drawn into the grip of the crusher action between the roll and the apron as they come together, cooperating teeth on said roll and said apron, means for driving said roll and apron at predetermined relative speeds to draw in and crush said material between them, and a vfree discharge for the material passing from said roll and apron.

3. A'roll crusher as set forth in claim 1 in which the means for driving the roll and apron comprises a speed change mechanism reducing the rate of lineal movement of the apron to less than that of the roll periphery.

EDWIN H. KEIPER.

REFERENCES CITED The following references are of record in the file of this patent: 1

UNITED STATES PATENTS 

